Yippee!
I just got the first volume of the RahXephon soundtrack in the mail today! The first title is a greatly extended version of the opening theme - I can notice the differences, even in Japanese! I jumped right to the 21st track which is the closing theme - I love that one too! It seems a bit longer, but I remember that the lyrics varied from episode to episoce, so there must be different "chapters" to the song. I remember that there is an English version shown in a few episodes, but I guess that it's not on this disk - maybe one of the other 3?
The rest of the music is the soundtrack played over most of the scenes, but it's hard to remember which episodes and themes were used where and when. I'd read the liner notes, but they're all in Japanese!
I'm having fun with it anyways!
Sayonara!
Bryan-san